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Haskell exercise
IO vanuit de stack
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import Control.Monad (guard)
import Control.Monad.Trans.Class (MonadTrans(lift))
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Trans.State.Lazy (StateT(..), get, put)
import Control.Monad.Trans.Maybe (MaybeT(..))
-- Stack Manipulation
---------------------
type Stack = [Int]
push :: Int -> MaybeT (StateT Stack IO) ()
push x = undefined
size :: MaybeT (StateT Stack IO) Int
size = undefined
pop :: MaybeT (StateT Stack IO) Int
pop = undefined
add :: MaybeT (StateT Stack IO) ()
add = undefined
mul :: MaybeT (StateT Stack IO) ()
mul = undefined
-- druk een lijn af met de bovenste waarde van de stapel
echo :: MaybeT (StateT Stack IO) ()
echo = undefined